what causes the digital display"engine power reduced" also van sputtering. on 2010 Chevrolet Express 3500

if i shut the motor off for a few minutes and restart it,it runs ok for a while and then it happens again.

Asked by for the 2010 Chevrolet Express 3500
fly by wire system is failing. it is a warranty item for you. call your dealer to confirm.

where is this located?
throttle body has 2 motors on the side and the pedal sensor under the dash has a module and sensor